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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal Teknik Sipil Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Journal of Geosciences and Applied Geology
Teuku Yan Waliana Muda Iskandarsyah
Program Studi Teknik Geologi, Fakultas Teknik Geologi, Universitas Padjadjaran
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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Zonasi Intrusi Air Laut pada Sistem Akuifer Tertekan Atas Cekungan Air Tanah Jakarta Mafira Yuwandari; Teuku Yan Waliana Muda Iskandarsyah; Mochamad Nursiyam Barkah; Taat Setiawan; Janner Rahmat Sudianto Nababan
Jurnal Lingkungan dan Bencana Geologi Vol 11, No 2 (2020)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v11i2.310

Abstract

Daerah Khusus Ibukota (DKI) Jakarta merupakan ibukota negara Indonesia yang terus berkembang pesat seiring dengan pertumbuhan industri, permukiman, perdagangan, dan jasa. Perkembangan daerah yang seiring dengan pertumbuhan penduduk mengakibatkan kebutuhan air bersih juga semakin meningkat. PDAM masih belum mampu mencukupi kebutuhan air masyarakat sehingga air tanah menjadi sumber air utama untuk kebutuhan harian dan komersil. Pemanfaatan air tanah yang tidak terkendali dapat mempengaruhi kondisi air tanah di Jakarta. Oleh karena itu, penelitian ini dilakukan untuk mengetahui kondisi air tanah di bagian utara CAT Jakarta khususnya pada sistem akuifer tertekan atas (40-140 mbmt) berdasarkan hasil pengamatan lapangan dan analisis laboratorium melalui 27 (dua puluh tujuh) sumur terpilih. Aliran air tanah daerah penelitian mengarah dari selatan ke utara. Hasil analisis Diagram Piper menunjukkan fasies air tanah daerah penelitian terbagi menjadi empat yaitu Na-HCO3 , Ca-HCO3 , Na-Cl, dan mixed (Ca-Na-HCO3 , Na-Ca-HCO3 , Ca-Na-HCO3 -Cl). Tingkat keasinan air tanah daerah penelitian terbagi menjadi dua zona yaitu tawar dan tawar-payau. Analisis rasio γNa/γCl, TDS terhadap elevasi MAT, DHL terhadap Cl, dan γCl/(γCO3 +γHCO3 ) menghasilkan lima zona intrusi yang mengalami perubahan dari tahun 2015 - 2018 yaitu zona air tawar, zona intrusi air laut sedikit, zona intrusi air laut sedang, zona intrusi air laut agak tinggi, dan zona intrusi air laut tinggi.Kata kunci: cekungan air tanah Jakarta, fasies air tanah, hidrokimia, intrusi air laut Special Capital Region of Jakarta, the capital city of Indonesia, is a rapidly developing city with a rapid growth in industry, population, business, and service. The rapid growth of population in the city has escalated the need for clean usable water. Groundwater has been the main source of water used by the people for daily needs and activities, since PDAM has failed to meet the needs effectively. Groundwater condition in Jakarta is likely to be affected by unauthorized misuses. Therefore, this research was conducted in order to examine the groundwater condition in northern part of Jakarta Groundwater Basin based on field observation and laboratory analysis of 27 selected wells. Groundwater flow in the northern part of Jakarta Groundwater Basin flowed from the south toward the north. Based on Piper Diagram analysis, groundwater facies were divided into four facies: Na-HCO3 , Ca-HCO3 , Na-Cl, and mixed (Ca-Na-HCO3 , Na-Ca-HCO3 , Ca-Na-HCO3 -Cl). Based on the salinity, the groundwater was divided into two zones: fresh water and fresh-brackish water. Based on the ratio of γNa/γCl, TDS to groundwater elevation, EC to Cl, and γCl/(γCO3 +γHCO3 ); there were five intrusion zones in the observed area: fresh water zone, slight seawater intrusion zone, medium seawater intrusion zone, slightly high seawater intrusion zone, and high seawater intrusion zone.Keywords: Jakarta groundwater basin, groundwater facies, hydrochemistry, seawater intrusion
Hydrogeochemical Characteristics and The Impact of Anthropogenic Activity on Groundwater Quality in the Banjaran Sub Urban Area West Java Indonesia. Rizka Maria; Teuku Yan Waliana Muda Iskandarsyah; Bombom Rachmat Suganda; Hendarmawan Hendarmawan
Jurnal Teknik Sipil Vol 29 No 3 (2022): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2022.29.3.2

Abstract

Abstract Banjaran Sub Urban Area in the Southern of Bandung Basin is a volcanic area with variations in lithology and anthropogenic activity that is growing. This study aims to determine the effect of geology and the environment on groundwater hydrochemical conditions in volcanic regions. The method that used are piper diagrams, Gibbs diagrams, correlation and major ion bivariate. Retrieval of 23 groundwater samples consisting of 10 dug wells, 10 drilling wells and 3 springs. The results showed that the groundwater interaction process was influenced by rock weathering. The hydrogeochemical process of major ions in groundwater volcanic regions is characterized by weathering of silica. Groundwater facies are CaMgCl, CaMgHCO3, NaHCO3. The hydrogeochemical process of major ions in groundwater volcanic regions is characterized by weathering of silica. Groundwater upstream area dominated influence by the groundwater-rock interaction, while groundwater downstream area was influenced by anthropogenic factors. Shallow groundwater with land cover agricultural and settlements is more susceptible to contamination by anthropogenic activities. High structural control allows water to flow through the fracture and facilitates the groundwater dilution process, thus helping the process of rock-water interaction. Keywords: Anthropogenic, hydrogeochemical, water-rock interaction, rock weathering. Abstrak. Banjaran adalah wilayah sub urban di daerah vulkanik Cekungan Bandung Selatan yang mengalami perkembangan antropogenik secara dinamis. Disisi lain, variasi kondisi geologi di daerah penelitian berpengaruh pada interaksi batuan dan airtanah. Berdasarkan pada latar belakang tersebut, penelitian ini bertujuan untuk mengetahui pengaruh geologi dan lingkungan terhadap kondisi hidrokimia airtanah di daerah vulkanik. Metode yang digunakan adalah diagram piper, diagram Gibbs, korelasi dan bivariat ion utama. Pengambilan sampel airtanah sebanyak 23 sampel yang terdiri dari 10 sumur gali, 10 sumur bor dan 3 mata air. Hasil penelitian menunjukkan bahwa proses interaksi airtanah dipengaruhi oleh pelapukan batuan. Proses hidrogeokimia ion-ion utama di daerah vulkanik air tanah dicirikan oleh pelapukan silika. Fasies airtanah adalah CaMgCl, CaMgHCO3, NaHCO3. Proses hidrogeokimia ion-ion utama di daerah vulkanik air tanah dicirikan oleh pelapukan silika. Daerah hulu airtanah dipengaruhi oleh interaksi airtanah-batuan, sedangkan daerah hilir airtanah dipengaruhi oleh faktor antropogenik. Airtanah dangkal dengan tutupan lahan pertanian dan pemukiman lebih rentan terhadap pencemaran oleh aktivitas antropogenik. Kontrol struktural yang tinggi memungkinkan air mengalir melalui rekahan dan memudahkan proses pengenceran air tanah, sehingga membantu proses interaksi airtanah-batuan. Kata kunci: Antropogenik, hidrogeokimia, interaksi airtanah-batuan, pelapukan batuan.
Geological Trap Controlling the Residence Time of Groundwater in Assessment of Exploitation Zone for Its Sustainable Resources Case Study: The Slope of Karang Mount, Banten Province, Indonesia Johanes Hutabarat; Azwar Satrya Muhammad; Teuku Yan Waliana Muda Iskandarsyah; Yudhi Listiawan; M. Ridfan Trisnadiansyah; Putu Ayu Andhira; Hendarmawan Hendarmawan
Indonesian Journal on Geoscience Vol. 10 No. 3 (2023)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.10.3.419-432

Abstract

The southern slope of Mount Karang is covered by complex volcanic deposits with complicated texture and structure. The study on zone or location of water resources which would be exploited required a comprehensive hydrogeological approach. Through detailed geological mapping, spring sampling, and well drilling were carried out. Representative spring water samples were taken to be analyzed in the laboratory, and to obtain the data of physical groundwater, chemical groundwater, stable isotopes 18O (oxygen-18), and deuterium contents, as well as the age of the groundwater. In general, the groundwater facies of the studied area showed Ca, Na, KHCO3 with several sites indicating changes to CaHCO3 during the dry and rainy seasons. The synthesis results of the stable isotope 18O (oxygen-18) and deuterium contents, verified by the physical and chemical groundwater controlled by geological setting in the groundwater subbasins, show the anomaly of residence time as trapped by the normal fault in the middle of the studied area. The existing normal fault might control this anomaly of residence time of groundwater surrounding site JH1, JH9, and JH20. However, the distribution of three different water source zones occurred. All group of groundwater indicated a complex flowing with geological setting controlling the physical, chemical content, and the age of the groundwater. At last, sites JH4, JH5, and JH9 show that the zones are proper to be developed as sustainability groundwater resources. Keywords: groundwater facies, stable isotope, groundwater flow, sustainable water
Geo-Environment Aspects Assessment Applied In Land Stability Determination Of A Disaster-Prone Area: A Case Study Around The Lembang Active Fault Zone, On The Western Part Of Bandung Basin, Indonesia Iskandarsyah, Teuku Yan Waliana Muda; Brilian, Ciria Humanis; Trisnadiansyah, Mochamad Ridfan; Listiawan, Yudhi; Barkah, M. Nursiyam; Sulaksana, Nana; Hendarmawan, Hendarmawan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.18062

Abstract

Rainfall, landforms, lithology or soil characteristics, and geological structures are geo-environment aspects that might be used to assess stability of the land in a disaster-prone area, e.g. in a case of study around the Lembang active fault zone of the western part of Bandung Basin, Indonesia. In this study, such geo-environment aspects were weighted and scored constantly in five class of value and importance, due to its influence on the land stability. After this scoring method applied, firstly, a land capability of the research area in relation to disaster potential will be recognized and used to analyze its land stability. According to such analyses, the study area can be divided into two zones of land stability, i.e. (i) moderate area which dominates the research area, and (ii) non-stable or unstable area near Lembang active fault zone. The dominant moderate and unstable area show that the fault zone has still widely affected the surroundings landscape and its physical characteristics. In fact, the current evaluation of existing landuse show that the development has been carried out intensively on these areas. It indicates that the development of the area is contituted as a high risk activity. Therefore, in this case, a good spatial planning or an environmental good governance must be applied appropriately in such disaster-prone area.
Rock Characteristics as The Basis of Aquifer Determination In Cianjur Sub-Watershed, Cugenang District, Cianjur Regency, West Java Province Husaeni, Ahmad; Listiawan, Yudhi; Fachrudin, Kurnia Arfiansyah; Iskandarsyah, Teuku Yan Waliana Muda
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i1.34872

Abstract

Based on Presidential Decree Number 12 of 2012, this research area is part of the Upstream Citarum watershed and part of the Citarum River Basin. The boundary of this research area is the Cianjur Sub-watershed which has an area of approximately 41.0 km2. The research area is the eastern part of Mount Gede. This study aimed to determine the characteristics of the lithology as the basis of aquifer determination that composed the research area based on the results of surface geological mapping and supported by petrographic analysis. This research used a method split into several stages, namely the stages of fieldwork, rock sampling, and laboratory analysis. At the fieldwork stage, geological mapping of the surface was carried out by observing rock outcrops in the research area. At the sampling stage, it is done by taking rock samples representing each rock unit in the research area. As for the last stage, laboratory analysis is performed using the petrographic analysis method, namely the analysis of thin sections on rock samples to observe each of the mineral contained and porosity characteristics in the rock samples. The results of the thin section analysis are then compared with the existing classifications. Based on the results of the analysis, the research area is composed of igneous rocks, volcanic rocks, and pyroclastic rocks which are divided into three (3) units, namely the Volcanic Breccia Unit (SBv), Volcanic Tuff Unit (STv), and Volcanic Lava Unit (SLv). Based on these three units of lithology, SBv which is a unit of volcanic breccia is an aquifer
Geological Hazard Potential Using Scoring And Weighting Method In Citeureup Sub-watershed, Citeureup District And Surrounding Area, Bogor Regency Adji, Andika Rhadiya Putra; Iskandarsyah, Teuku Yan Waliana Muda; Listiawan, Yudhi
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.57037

Abstract

Geological hazards are hazard caused by geological processes. Citeureup Sub-watershed, located in Bogor Regency, is a densely populated area threaten by geological hazards. The purpose of this study is to determine the distribution of geological hazards using scoring and weighting method. Factors that analyzed to determine hazards potential including: slope, rocks physical property, lineament density, and rainfall. Hazard potential in study area divided into five different levels, ranging from very low to very high, with geological hazards in the form of mass movement and earthquake. Main factor of mass movement hazard potential is slope, meanwhile earthquake potential hazard main factor is lineament density, which indicates geological structure. Rocks physical property and rainfall are supporting factors that can increase geological hazards potential.
Control of Geological Structure on the Springs Distribution and Their Physical Properties. Case Study: Southern Slope of Mt. Lampobattang, South Sulawesi MAHENDRA, GALIH AJI; Waliana Muda Iskandarsyah, Teuku Yan; ismawan, Ismawan ismawan; Brilian, Ciria Humanis
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.21235

Abstract

The study area is located at Southern Slope of Mt. Lampobattang, South Sulawesi. According to Armstrong (2012), Sulawesi is controlled by a complex geological structure. This condition can affect the characteristics of subsurface groundwater (Ismawan, 2013) specifically on the distribution and physical properties of springs. So, this research is needed to do. The aim of this study is to know the effect of geological structure on the distribution and physical properties of springs in the study area. This research was conducted with a qualitative analysis method of field data which resulted by geological and hydrogeological mapping at the study area. Based on the analysis results, the study area is consisted of 7 rock units consist of tuff, breccia and lava. There are 6 faults that control the study area with SW-NE and SE-NW trend. The study area is divided into 3 fracture density zones, those are low fracture density (0-500 M-1), medium fracture density (500-950 M-1), and high fracture density (950-1200 M-1). The geological structure affects the distribution of springs and their physical characteristics. This is evidenced by the appearance of springs along the fault and in the medium to high density zone. The characteristics of the Physical Properties of springs are influenced by the occurrence of faults and fractures in the study area that make the low values of EC and TDS. TDS values of springs have a vulnerable value of 0-193 ppm and EC values 0-357 μS. Therefore, the fracture and fault as the geological structure affect the distribution and physical properties of springs in the study area.
Groundwater Characteristics Analysis to Identify the Seawater Intrusion in Coastal Deep Aquifer System, Semarang, Central Java, Indonesia Listiawan, Yudhi; Virgianty, Aisyah Shafa; Pramudyo, Tulus; Iskandarsyah, Teuku Yan Waliana Muda
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.18561

Abstract

The study area is located in Semarang, representing a coastal and industrial zone where groundwater exploited as main water resources. Seawater instrusion has been identified as a significant issue in coastal regions due to its impact on groundwater quality. The study was conducted using groundwater data from deep aquifers (bore wells). The physical and chemical contents were analyzed to determine the groundwater characteristics and identify the seawater intrusion. Piper and Durov diagram were used to determine the hydrochemical facies and the main processes that influence the chemical content in groundwater. The Cl vs Na/Cl ratio diagram were used to identify the source of Cl and Na ions, determining weather the ions originate from anthropogenic activites or seawater intrusion. The Physical properties of groundwater show that the groundwater in the study area is divided into 2 group: a freshwater group with TDS value <1000 mg/L and a brackish water group with TDS value ranging from 1000 – 4006 mg/L. The results of hydrochemical analysis indicates the occurrence of seawater intrusion in some locations. Seawater intrusion in the study area mainly occurs in the northern part of Semarang city which relatively near with coastal line. The seawater intrusion also occurs in the eastern part of study area (Demak) with a more severe level, reaching areas at a further distance from coastal line compared to Semarang city.
KARAKTERISTIK AIR TANAH PADA AKIFER VULKANIK DI LERENG TENGGARA GUNUNG PULOSARI, PANDEGLANG, PROVINSI BANTEN Listiawan, Yudhi; Hadian, Mohamad Sapari Dwi; Muda Iskandarsyah, Teuku Yan Waliana; Muhammad, Azwar Satrya; Barkah, Mochamad Nursiyam
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.671 KB) | DOI: 10.24198/bsc.v18i1.27090

Abstract

Gunung Pulosari merupakan Gunung Api strato yang terletak di daerah Pandeglang Provinsi Banten. Daerah penelitian disusun oleh batuan vulkanik yang memiliki potensi air tanah yang besar. Masih sedikitnya ekploitasi air tanah, membuat daerah di sekitar Gunung Pulosari ini menarik untuk diteliti kondisi hidrogeologinya.Tujuan dari penelitian ini adalah menentukan karakteristik air tanah berdasarkan sifat fisik dan kimia air tanah serta kaitannya dengan kondisi geologi yang berkembang di daerah penelitian dengan melakukan pemetaan hidrogeologi. Dari hasil pemetaan hidrogeologi dan didapatkan sebanyak 13 lokasi pengamatan yang terdiri 10 mata air dan 3 sumur gali. Sifat fisik air menunjukan karakteristik yang homogen, nilai Daya Hantar Listrik (DHL) 60 sampai 190 μS/cm, Zat Padat Terlarut (ZPT) dari 20 sampai 90 mg/L, pH dari 4,7 sampai 8,2 dan suhu air dari 25 sampai 26,9 oC.  Sebanyak 5 sampel dilakukan uji kimia air tanah untuk di analisis fasies kimia air dengan diagram triliniear Piper.Dari hasil penelitian didapatkan fasies kimia air tanah di daerah penelitian didominasi oleh Ca:HCO3 dan satu lokasi (P-3) Ca.Na:HCO3. Hal ini mengindikasikan bahwa air tanah masih dipengaruhi oleh kondisi permukaan dan sistem alirannya masih bersifat lokal.
GEOLOGY OF CIBEUREUM AND SURROUNDING AREAS, CIBEUREUM DISTRICT, KUNINGAN REGENCY, WEST JAVA PROVINCE Ahmadjayadi, Tigfhar; Pratiwi, Santi Dwi; Iskandarsyah, Teuku Yan Waliana Muda
Bulletin of Scientific Contribution Vol 21, No 1 (2023): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v21i1.46128

Abstract

This study compiled a comprehensive geological map of Cibeureum and its surrounding areas in Cibeureum District, Kuningan Regency, West Java, using primary data and systematic geological methods, including field observations, data sampling, and laboratory analysis. Geographically, the area is located at 108o 42' 33.75"–108o 45' 16.8" East Longitude and 7o 02' 10.31"–7o 04' 52.20" South Latitude. The main purpose of this study is to identify the geological characteristics and phenomena that might have occurred in the past as well as in the future. In this study, geomorphological analysis was carried out, based on morphography, morphometry, and morphogenetic interpretations; stratigraphic analysis, based on interpretation of rock units, ages, and depositional environments; and analysis of geological structures, based on interpretation of DEM data and field observations. The results showed that the study area consists of very fine-coarse sandstones with carbonate and non-carbonate properties, claystone, and tuff. The geomorphological units are divided into four, namely Volcanic Stepping Hills, Structural Stepping Hills, Denudational Plains, and Denudational Slightly Steep Low Hills. Geological structures found in the field are folds, faults and joints. Based on the distribution of lithology, reconstruction of strike-dip patterns, and biostratigraphy analysis, the depositional of informal lithostratigraphy units in the study area began in the Middle Miocene and continued into the Quartenary, starts from Sandstone Units (Tmpbp) in N10 to N21, Claystone Unit (Tmpbl) in N12 to N21, Interbedded Claystone and Sandstone Unit (Tmpblbp) in N16 to N19, and continued with the deposition of Tuff Unit (Qt).
Co-Authors Adji, Andika Rhadiya Putra Ahmadjayadi, Tigfhar Azwar Satrya Muhammad Bombom Rachmat Suganda Boy Yoseph Cahya Sunan Sakti Syah Alam Brilian, Ciria Humanis Fachrudin, Kurnia Arfiansyah Hadi Hidayat Hendarmawan Hendarmawan ismawan, Ismawan ismawan Janner Rahmat Sudianto Nababan Johanes Hutabarat M. Nursiyam Barkah, M. Nursiyam M. Ridfan Trisnadiansyah Mafira Yuwandari MAHENDRA, GALIH AJI Mochamad Nursiyam Barkah Mohamad Sapari Hadian Muhammad, Azwar Satrya Nana Sulaksana Pramudyo, Tulus Putu Ayu Andhira Rizka Maria Taat Setiawan Trisnadiansyah, Mochamad Ridfan Uus Ahmad Husaeni Virgianty, Aisyah Shafa Yudhi Listiawan